Go (Baduk, Weiqi) problems with solutions

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Life-and-death problem (tsumego) 054

Black to play. How can Black kill the white group?

(;
GM[1]FF[4]VW[]AP[goproblems.ru]
SZ[19]
ST[1]
AB[br][cq][dq][er][es][do][ep][fp][gp][hp][jp][ip][kp][kq][kr][ks]
AW[dr][cr][eq][fq][fr][jq][iq][hq][jr][js]
C[Black to play
How can Black kill the white group?
]
(;B[gq]
TE[1]C[Correct answer
];W[gr];B[hr];W[hs];B[ir];W[is];B[hr];W[ir];B[fs])
(;B[hs]
BM[1]C[Wrong answer
];W[hr];B[fs];W[gr])
(;B[cs]
BM[1]C[Wrong answer
];W[gq]
C[White still has the kikashi at A, and so lives.
]LB[fs:A]
))

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